48 CARL SKOTTSBERG, MARINE ALG^I 1. PHiEOPHYCEiE. 



otherwise alike (p. 89) and finds it possible that there are two closely allied species 

 confounded under one name. Guignard made the same observation. Hooker's 

 material as well as the plants collected by the writer in 1902 had numerous mucilage 

 canals. Bory did not observe them, at least he does not mention any. J. Agardh, 

 Anal. Algol, contin. 2 p. 88, discusses the possibility of subdividing the genus into 

 two sections corresponding to Hafgygia and Laminaria of Areschoug; he considered 

 the true L. nigrescens to lack mucilage ducts. 



No »true» L. nigrescens bas been found in the Falkland Islands. Still, from 

 reasons given under L. flavicans, I retain the Falkland plant under the old name, 

 adding »f. lacunifera» for convenience sake. 



The specimens I brought from the coast of Chile (Valparaiso, Chiloé) have much 

 narrower blades than all I have seen in the south. Further, they are quite destitute 

 of mucilage ducts, and the leaves have a parenchyma of small and very close cells. 

 Externally they are very like Howe's plants from Peru, which he called L. nigrescens. 

 On the other hand, they seem to represent Bory's Himanthalia Montagnei, Voy. 

 Coquille p. 135 and Agardh's L. Suhrii, Sp. Alg. I p. 150. We might do well in 

 distinguishing this form under the name f. Montagnei. The specimens from Chiloé 

 have strongly flattened branches and stipes, gradually passing into blades not much 

 broader than the latter. The primary stem is hardly developed at all, just as in 

 Howe's figure on plate 17. • 



f. Montagnei: Chile: Valparaiso, rocks near Playa Ancha (St. 41, 2. 9. 08); 

 Chiloé, Morro Vilcun (2. 8. 08). Forming associations in the upper sublitoral in both 

 places. 



f. lacunifera: Fuegia: San Felix Island, pure stånds in the upper sublitoral 

 (St. 24, 24. 5. 08, sp.). Falkland I s 1 a n d s: common on exposed coasts, forming 

 extensive associations in the uppermost part of the sublitoral region and partly un- 

 covered during a short while at low tide, although washed by the surf ; also in rock- 

 pools higher up, f. inst. at Cape Pembroke (St. 3, Nov. 07 — Feb. 08, sp.). — It seems 

 to be the rule here that the primary stipe remains short and gradually becomes hidden 

 under the hapteres while stems are formed by the branches; it is also common that 

 of the two twin branches one becomes elongated, while the other remains short. If 

 this is repeated, a kind of sympodium results, as shown in Bory's figure on plate 

 5 A. The width of the blade varies a great deal but seldom exceeds 3 cm; the 

 margin becomes thickened with age and shows some small obtuse teeth. 



Distribution: Peru — Fuegia, Falkl., Heard I. 



L. frutescens Skottsb. Ant. Meeresalg. I p. 78. 



Falkland Islands: Cape Pembroke, in the lower litoral region (St. 3, 7. 

 11. 07, 7. 1. 08); Westpoint Isl., tide-pools (St. 8, 5. 12. 07). — Only reported from 

 the Falklands. 



The plants described as L. frutescens were so unlike ordinary nigrescens from 

 the same habitat that I was unable to ref er them to that species. What I have 

 collected this time is in part exactly like my old material, but partly approaches 



